Gas Ass 

Gas Ass is a terrible condition in which a person is constantly letting out extremely stinky farts. Another name for this is "Chronic Flatulence" but "Gas Ass" is easier to remember and it's more modern. After a period of time of having Gas Ass, the butt will smell like stinky poop for the next 24 hours. Gas Ass is so bad that the farts stink up the entire room and it smells so bad that everyone else in the room has to leave while moaning, coughing, wheezing, etc. and putting their noses in their shirts and their eyes close. Usually they will be cursing, screaming, etc. When one has Gas Ass, you can literally see a cloud of brown hover around their butt. Gas Ass is a condition that no one should have and should be treated as soon as it's discovered.

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Situation 1:

Calvin was sitting in class one day when he started to absolutely rip ass and loud and horrible-smelling as humanly possible.

Michael: Dude, Calvin has the worst case of Gas Ass ever!
Dude: I know!

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Situation 2:

Calvin has Gas Ass later that night and is absolutely ripping ass at the dinner table.

The Dad: Calvin, that smells f*cking terrible, what is your sh*t?

Sister: OHMYGODITSMELLSSOBAD!!!!!!!!!!!

The mom then passes out while the sister and the dad evacuate the room while Calvin has a big smile on his face.

Gas Ass by TheGasAssMaster December 4, 2012

Gas Ass 

The act of inserting a gas pump into your anal cavity and proceeding to pump gas.

I wouldn't pledge Chad's frat, I heard he likes getting gas ass

Gas Ass by Graet August 4, 2018

ass gas 

fart

dude, you smell like ass gas

ass gas by d October 1, 2003

Pre Shit Ass Gas 

extremely stinky flatulence prior to dropping a deuce

Gas before a person defecates

dude i will see you later, your standing down wind in my pre shit ass gas. gotta go drop the deuces

Pre Shit Ass Gas by paintblusher pantie dropper April 11, 2011

ass gas or grass

The most acceptable forms of payment for the favor of being given a ride to any destination. Roughly translates to: money, weed, or sex (oral sex is also acceptable). Gifts should be given promptly and without hesitation.

Brian: Well, here we are.

Girl: Aw, well thanks for the ride Brian-

*she begins to exit the car*

Brian: Hey- hey, hey! Not so fast, its ass gas or grass in this car, bitch. And it seems I've got a full tank and plenty of the fine erb, so uhhh... *nods head, indicating genitals*

ass gas or grass by BES the best September 4, 2008

ass gas 

Term my grandmother used to refer to farts that have been both squashed and amplified by sitting in a leather reclinign chair during the release.

If it wasn't my grandmother, I would have told the supplier of the ass gas to drop dead in an effort to shut their asshole.

ass gas by Dead Menace August 7, 2009

ass gas or grass

If someone is asking you for a ride and you don´t feel the need to give it away for nothing, it´s a good opportunity to ask for "ass, gas or grass".

Meaning you wish to take advantage of the situation by getting a good fuck, some bucks for the gas you´re gonna need or at least something to get a buzz from.

(Maybe one of you might describe it better, as I´m by no means a native speaker!)

"You wanna go to Mexico with me? Take a ride? Well, what´s your currency...
ass gas or grass ?
Nobody rides for free, you know?!"

ass gas or grass by Fichtelschwein February 5, 2010